Who Owns White Mountains Insurance Group, Ltd. (WTM)?Hedge Fund & Institutional Holders

$2195.88+13.82 (+0.63%)Financial ServicesNYSE

Institutional Holders

50

as of Q4 2025

Total Institutional Value

$InfinityT

% of Float Held

2.046834967147807e+220%

QoQ Change in Holders

+8 / -4

Price History

$1650.50$1798.91$1947.32$2095.73$2244.14Sep 24Jun 25Mar 26

WTM — Biggest New Institutional Buyers This Quarter

FundActionShares AddedValue Added
Entropy Technologies, LPNew Position+490+$1.0T
COOKE & BIELER LPNew Position+107K+$221.5B
REINHART PARTNERS, LLC.New Position+44K+$91.4B
Neuberger Berman Group LLCIncreased+15K+$75.8B
River Road Asset Management, LLCIncreased+11K+$68.0B
FULLER & THALER ASSET MANAGEMENT, INC.Increased+81+$43.3B
WCM INVESTMENT MANAGEMENT, LLCNew Position+11K+$22.2B
D. E. Shaw & Co., Inc.Increased+6K+$12.8B
Mraz, Amerine & Associates, Inc.Increased+23+$9.2B
FIRST TRUST ADVISORS LPNew Position+5K+$9.0B
DARK FOREST CAPITAL MANAGEMENT LPNew Position+4K+$7.0B
LEE DANNER & BASS INCNew Position+3K+$6.4B
SEI INVESTMENTS COIncreased+3K+$6.0B
HORIZON KINETICS ASSET MANAGEMENT LLCIncreased+37+$5.4B
NEW YORK STATE COMMON RETIREMENT FUNDNew Position+3K+$5.0B

WTM — Institutions Reducing or Closing Positions

FundActionShares SoldValue Sold
Cannell & Spears LLCDecreased-173-$47.2B
Perpetual LtdClosed Position-8K-$13.6B
SUSQUEHANNA INTERNATIONAL GROUP, LLPDecreased-7K-$12.3B
JANE STREET GROUP, LLCDecreased-3K-$8.1B
UBS Group AGDecreased-6K-$7.7B
Lighthouse Investment Partners, LLCClosed Position-3K-$4.9B
JPMORGAN CHASE & CODecreased-3K-$4.2B
LPL Financial LLCDecreased-341-$3.9B
Legal & General Group PlcDecreased-1K-$2.8B
AMERICAN CENTURY COMPANIES INCDecreased-1K-$2.7B
HighTower Advisors, LLCDecreased-18-$2.4B
CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEMDecreased-3K-$2.4B
ROYAL BANK OF CANADADecreased-673-$2.0B
Cove Street Capital, LLCClosed Position-1K-$1.8B
ODDO BHF ASSET MANAGEMENT SASClosed Position-930-$1.6B

Top Institutional Holders(Q4 2025)

#FundSharesValue% of PortfolioType
1Entropy Technologies, LP490$1.0T0.05%Share
2DIMENSIONAL FUND ADVISORS LP150,043$311.0B0.07%Share
3Neuberger Berman Group LLC128,474$266.0B0.20%Share
4River Road Asset Management, LLC120,880$251.2B2.76%Share
5FULLER & THALER ASSET MANAGEMENT, INC.108,172$224.0B0.77%Share
6COOKE & BIELER LP106,579$221.5B2.31%Share
7FIDUCIARY MANAGEMENT INC /WI/90,333$187.0B2.06%Share
8LONDON CO OF VIRGINIA58,697$122.0B0.70%Share
9REINHART PARTNERS, LLC.43,973$91.4B2.74%Share
10Boston Partners44,253$91.0B0.09%Share
11Boston Partners30,407$63.0B0.07%Share
12SOUTHEASTERN ASSET MANAGEMENT INC/TN/26,246$54.5B2.43%Share
13CHARLES SCHWAB INVESTMENT MANAGEMENT INC23,238$48.0B0.01%Share
14Mraz, Amerine & Associates, Inc.22,629$47.0B6.99%Share
15BANK OF AMERICA CORP /DE/18,585$38.0B0.00%Share
16BROWN ADVISORY INC18,662$38.0B0.05%Share
17HORIZON KINETICS ASSET MANAGEMENT LLC13,121$27.3B0.37%Share
18WELLINGTON MANAGEMENT GROUP LLP13,271$27.0B0.00%Share
19RAYMOND JAMES FINANCIAL INC12,101$25.0B0.01%Share
20NORTHERN TRUST CORP11,860$24.0B0.00%Share
21RAYMOND JAMES FINANCIAL INC11,080$23.0B0.01%Share
22WCM INVESTMENT MANAGEMENT, LLC10,682$22.2B0.05%Share
23D. E. Shaw & Co., Inc.8,193$17.0B0.01%Share
24WELLS FARGO & COMPANY/MN7,328$15.0B0.00%Share
25HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC6,752$14.0B0.04%Share
26SEI INVESTMENTS CO7,054$14.0B0.01%Share
27CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM6,716$13.0B0.01%Share
28Gotham Asset Management, LLC6,716$13.0B0.05%Share
29VICTORY CAPITAL MANAGEMENT INC6,296$13.0B0.01%Share
30ROYCE & ASSOCIATES LP5,947$12.4B0.13%Share
31SOUTHEASTERN ASSET MANAGEMENT INC/TN/5,406$11.2B0.50%Share
32Swiss National Bank5,086$10.0B0.01%Share
33DIMENSIONAL FUND ADVISORS LP5,041$10.0B0.00%Share
34Williams Jones Wealth Management, LLC.5,193$10.0B0.11%Share
35UBS Group AG4,566$9.5B0.00%Share
36AQR CAPITAL MANAGEMENT LLC4,444$9.0B0.00%Share
37BANK OF AMERICA CORP /DE/4,656$9.0B0.00%Share
38FIRST TRUST ADVISORS LP4,555$9.0B0.01%Share
39RHUMBLINE ADVISERS4,165$8.0B0.01%Share
40GOLDMAN SACHS GROUP INC4,247$8.0B0.00%Share
41DARK FOREST CAPITAL MANAGEMENT LP3,615$7.0B0.32%Share
42LEE DANNER & BASS INC3,103$6.4B0.46%Share
43Nuveen, LLC3,230$6.0B0.00%Share
44BANK OF AMERICA CORP /DE/3,081$6.0B0.00%Share
45Brandywine Global Investment Management, LLC3,226$6.0B0.04%Share
46AMERIPRISE FINANCIAL INC2,969$6.0B0.00%Share
47NORTHERN TRUST CORP2,722$5.0B0.00%Share
48STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM2,792$5.0B0.01%Share
49NEW YORK STATE COMMON RETIREMENT FUND2,513$5.0B0.01%Share
50CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2,457$5.0B0.01%Share

WTM Institutional Ownership History

QuarterHoldersTotal ValueChange
Q4 2025348$3.6T+122
Q3 2025226$1.9T-57
Q2 2025283$1.8T-33
Q1 2025316$3.2T+23
Q4 2024293$23.0T+51
Q3 2024242$135.4T+4
Q2 2024238$203.7T+14
Q1 2024224$412.9T—

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As of Q4 2025, 50 institutional investors hold WTM (White Mountains Insurance Group, Ltd.). The largest holder is Entropy Technologies, LP with $1.0T in shares. This quarter, 8 institutions opened new positions and 4 closed their positions.

Frequently Asked Questions

How many hedge funds own WTM?

As of Q4 2025, 50 institutional investors report holding WTM (White Mountains Insurance Group, Ltd.) in their 13F filings.

Who is the largest institutional holder of WTM?

The largest institutional holder of WTM is Entropy Technologies, LP with $1.0T in shares.

Is institutional ownership of WTM increasing or decreasing?

This quarter, 8 institutions opened new positions in WTM and 4 closed their positions.